Ball Pen is an Edit Mode tool that allows you to draw 3D meshes freehand directly within the viewport. Functioning similarly to Z-spheres or a volumetric snake hook, it enables rapid form construction without focusing on topology.

The tool operates by generating continuous strings of either spheres or rectangular tubes. Drawing begins on an existing surface and can extend freely into 3D space, utilizing the view plane to dictate depth. It features surface snapping, real-time brush size adjustments, and tablet pressure sensitivity. Existing strokes can be individually selected, moved, or rotated after placement. The generated structures are designed to be solidified using Blender's voxel remesh capabilities, making it an efficient starting point for sculpting workflows.